<template>
  <view class="calendar-wrapper">
    <view class="header" v-if="headerBar">
      <view class="pre" @click="changeMonth('pre')">
        <text class="fu-iconfont2" :style="[yaColor]">&#xE807;</text>
      </view>
      <view>{{y+$t('年')+formatNum(m)+$t('月')}}</view>
      <view class="next" @click="changeMonth('next')">
        <text class="fu-iconfont2" :style="[yaColor]">&#xE7af;</text>
      </view>
    </view>
    <view class="week">
      <view class="week-day" v-for="(item, index) in weekDay" :key="index">{{ item }}</view>
    </view>
    <view :class="{ hide: !monthOpen }" class="content" :style="{ height: height }">
      <view :style="{ top: positionTop + 'rpx' }" class="days">
        <view class="item" v-for="(item, index) in dates" :key="index">
          <view class="day" @click="selectOne(item, $event)" :class="{
                            choose: choose == `${item.year}-${item.month}-${item.date}`&&item.isCurM,
                            nolm: !item.isCurM,
                            today: isToday(item.year, item.month, item.date),
                            isWorkDay: isWorkDay(item.year, item.month, item.date)
                        }">
            {{ Number(item.date) }}
          </view>
          <view class="markDay" v-if="isMarkDay(item.year, item.month, item.date)&&item.isCurM"></view>
          <!-- <view class="today-text" v-if="isToday(item.year, item.month, item.date)">今</view> -->
        </view>
      </view>
    </view>
    <image src="https://i.loli.net/2020/07/16/2MmZsucVTlRjSwK.png" mode="scaleToFill" v-if="collapsible" @click="toggle"
      class="weektoggle" :class="{ down: monthOpen }"></image>
  </view>
</template>

<script>
  export default {
    name: 'ren-calendar',
    props: {
      // 星期几为第一天(0为星期日)
      weekstart: {
        type: Number,
        default: 0
      },
      // 标记的日期
      markDays: {
        type: Array,
        default: () => {
          return [];
        }
      },
      //是否展示月份切换按钮
      headerBar: {
        type: Boolean,
        default: true
      },
      // 是否展开
      open: {
        type: Boolean,
        default: true
      },
      //是否可收缩
      collapsible: {
        type: Boolean,
        default: true
      },
      //未来日期是否不可点击
      disabledAfter: {
        type: Boolean,
        default: false
      }
    },
    data() {
      return {
        weektext: [global.i18n.t('日'), global.i18n.t('一'), global.i18n.t('二'), global.i18n.t('三'), global.i18n.t('四'),
          global.i18n.t('五'), global.i18n.t('六')
        ],
        y: new Date().getFullYear(), // 年
        m: new Date().getMonth() + 1, // 月
        dates: [], // 当前月的日期数据
        positionTop: 0,
        monthOpen: true,
        choose: ''
      };
    },
    created() {
      this.dates = this.monthDay(this.y, this.m);
      !this.open && this.toggle();
    },
    mounted() {
      this.choose = this.getToday().date;
    },
    computed: {
      // 顶部星期栏
      weekDay() {
        return this.weektext.slice(this.weekstart).concat(this.weektext.slice(0, this.weekstart));
      },
      height() {
        return (this.dates.length / 7) * 80 + 'rpx';
      }
    },
    methods: {
      formatNum(num) {
        let res = Number(num);
        return res < 10 ? '0' + res : res;
      },
      getToday() {
        let date = new Date();
        let y = date.getFullYear();
        let m = date.getMonth();
        let d = date.getDate();
        let week = new Date().getDay();
        let weekText = ['日', '一', '二', '三', '四', '五', '六'];
        let formatWeek = '星期' + weekText[week];
        let today = {
          date: y + '-' + this.formatNum(m + 1) + '-' + this.formatNum(d),
          week: formatWeek
        };
        return today;
      },
      // 获取当前月份数据
      monthDay(y, month) {
        let dates = [];
        let m = Number(month);
        let firstDayOfMonth = new Date(y, m - 1, 1).getDay(); // 当月第一天星期几
        let lastDateOfMonth = new Date(y, m, 0).getDate(); // 当月最后一天
        let lastDayOfLastMonth = new Date(y, m - 2, 0).getDate(); // 上一月的最后一天
        let weekstart = this.weekstart == 7 ? 0 : this.weekstart;
        let startDay = (() => {
          // 周初有几天是上个月的
          if (firstDayOfMonth == weekstart) {
            return 0;
          } else if (firstDayOfMonth > weekstart) {
            return firstDayOfMonth - weekstart;
          } else {
            return 7 - weekstart + firstDayOfMonth;
          }
        })();
        let endDay = 7 - ((startDay + lastDateOfMonth) % 7); // 结束还有几天是下个月的
        for (let i = 1; i <= startDay; i++) {
          dates.push({
            date: this.formatNum(lastDayOfLastMonth - startDay + i),
            day: weekstart + i - 1 || 7,
            month: m - 1 >= 0 ? this.formatNum(m - 1) : 12,
            year: m - 1 >= 0 ? y : y - 1
          });
        }
        for (let j = 1; j <= lastDateOfMonth; j++) {
          dates.push({
            date: this.formatNum(j),
            day: (j % 7) + firstDayOfMonth - 1 || 7,
            month: this.formatNum(m),
            year: y,
            isCurM: true //是否当前月份
          });
        }
        for (let k = 1; k <= endDay; k++) {
          dates.push({
            date: this.formatNum(k),
            day: (lastDateOfMonth + startDay + weekstart + k - 1) % 7 || 7,
            month: m + 1 <= 11 ? this.formatNum(m + 1) : 0,
            year: m + 1 <= 11 ? y : y + 1
          });
        }
        // console.log(dates);
        return dates;
      },
      isWorkDay(y, m, d) {
        //是否工作日
        let ymd = `${y}/${m}/${d}`;
        let formatDY = new Date(ymd.replace(/-/g, '/'));
        let week = formatDY.getDay();
        if (week == 0 || week == 6) {
          return false;
        } else {
          return true;
        }
      },
      isFutureDay(y, m, d) {
        //是否未来日期
        let ymd = `${y}/${m}/${d}`;
        let formatDY = new Date(ymd.replace(/-/g, '/'));
        let showTime = formatDY.getTime();
        let curTime = new Date().getTime();
        if (showTime > curTime) {
          return true;
        } else {
          return false;
        }
      },
      // 标记日期
      isMarkDay(y, m, d) {
        let flag = false;
        for (let i = 0; i < this.markDays.length; i++) {
          let dy = `${y}-${m}-${d}`;
          if (this.markDays[i] == dy) {
            flag = true;
            break;
          }
        }
        return flag;
      },
      isToday(y, m, d) {
        let checkD = y + '-' + m + '-' + d;
        let today = this.getToday().date;
        if (checkD == today) {
          return true;
        } else {
          return false;
        }
      },
      // 展开收起
      toggle() {
        this.monthOpen = !this.monthOpen;
        if (this.monthOpen) {
          this.positionTop = 0;
        } else {
          let index = -1;
          this.dates.forEach((i, x) => {
            this.isToday(i.year, i.month, i.date) && (index = x);
          });
          this.positionTop = -((Math.ceil((index + 1) / 7) || 1) - 1) * 80;
        }
      },
      // 点击回调
      selectOne(i, event) {
        let date = `${i.year}-${i.month}-${i.date}`;
        let selectD = new Date(date).getTime();
        let curTime = new Date().getTime();
        let week = new Date(date).getDay();
        let weekText = ['日', '一', '二', '三', '四', '五', '六'];
        let formatWeek = '星期' + weekText[week];
        let response = {
          date: date,
          week: formatWeek
        };
        if (!i.isCurM) {
          // console.log('不在当前月范围内');
          return false;
        }
        if (selectD > curTime) {
          if (this.disabledAfter) {
            console.log('未来日期不可选');
            return false;
          } else {
            this.choose = date;
            this.$emit('onDayClick', response);
          }
        } else {
          this.choose = date;
          this.$emit('onDayClick', response);
        }
        console.log(response);
      },
      //改变年月
      changYearMonth(y, m) {
        this.dates = this.monthDay(y, m);
        this.y = y;
        this.m = m;
      },
      changeMonth(type) {
        if (type == 'pre') {
          if (this.m + 1 == 2) {
            this.m = 12;
            this.y = this.y - 1;
          } else {
            this.m = this.m - 1;
          }
        } else {
          if (this.m + 1 == 13) {
            this.m = 1;
            this.y = this.y + 1;
          } else {
            this.m = this.m + 1;
          }
        }
        this.dates = this.monthDay(this.y, this.m);
      }
    }
  };
</script>

<style lang="scss" scoped>
  .calendar-wrapper {
    color: #bbb7b7;
    font-size: 28rpx;
    text-align: center;
    background-color: #fff;
    padding-bottom: 10rpx;

    .header {
      display: flex;
      align-items: center;
      justify-content: center;
      height: 88rpx;
      color: #42464A;
      font-size: 32rpx;
      font-weight: bold;
      border-bottom: 2rpx solid #f2f2f2;

      .pre,
      .next {
        color: #912F22;
        font-size: 28rpx;
        font-weight: normal;
        padding: 8rpx 15rpx;
        border-radius: 10rpx;
        border: 2rpx solid #dcdfe6;
      }

      .pre {
        margin-right: 30rpx;
      }

      .next {
        margin-left: 30rpx;
      }
    }

    .week {
      display: flex;
      align-items: center;
      height: 80rpx;
      line-height: 80rpx;
      border-bottom: 1rpx solid rgba(255, 255, 255, 0.2);

      view {
        flex: 1;
      }
    }

    .content {
      position: relative;
      overflow: hidden;
      transition: height 0.4s ease;

      .days {
        transition: top 0.3s;
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        position: relative;

        .item {
          position: relative;
          display: block;
          height: 80rpx;
          line-height: 80rpx;
          width: calc(100% / 7);

          .day {
            font-style: normal;
            display: inline-block;
            vertical-align: middle;
            width: 60rpx;
            height: 60rpx;
            line-height: 60rpx;
            overflow: hidden;
            border-radius: 60rpx;

            &.choose {
              background-color: #912F22;
              color: #fff;
            }

            &.nolm {
              color: #fff;
              opacity: 0.3;
            }
          }

          .isWorkDay {
            color: #42464a;
          }

          .notSigned {
            font-style: normal;
            width: 8rpx;
            height: 8rpx;
            background: #fa7268;
            border-radius: 10rpx;
            position: absolute;
            left: 50%;
            bottom: 0;
            pointer-events: none;
          }

          .today {
            color: #fff;
            background-color: #912f2280;
          }

          .workDay {
            font-style: normal;
            width: 8rpx;
            height: 8rpx;
            background: #912F22;
            border-radius: 10rpx;
            position: absolute;
            left: 50%;
            bottom: 0;
            pointer-events: none;
          }

          .markDay {
            font-style: normal;
            width: 8rpx;
            height: 8rpx;
            background: #912F22;
            border-radius: 10rpx;
            position: absolute;
            left: 45%;
            bottom: 5rpx;
            pointer-events: none;
          }
        }
      }
    }

    .hide {
      height: 80rpx !important;
    }

    .weektoggle {
      width: 85rpx;
      height: 32rpx;
      position: relative;
      bottom: -42rpx;

      &.down {
        transform: rotate(180deg);
        bottom: 0;
      }
    }
  }
</style>